.\" $OpenBSD: gcu.4,v 1.5 2013/07/16 16:05:48 schwarze Exp $
.\"
.\" Copyright (c) 2009 Dariusz Swiderski <sfires@sfires.net>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd $Mdocdate: July 16 2013 $
.Dt GCU 4
.Os
.Sh NAME
.Nm gcu
.Nd Intel EP80579 Global Configuration Unit
.Sh SYNOPSIS
.Cd "gcu* at pci?"
.Sh DESCRIPTION
The
.Nm
driver provides access to the miibus that is hidden behind the GCU device.
It is used to control PHYs on embedded designs utilizing Intel's EP80579
chips.
.Pp
The GCU also provides access to CAN, SSP and TDM signal strength drivers,
but since they are not supported by
.Ox
the driver does not provide any
functionality related to them.
.Sh SEE ALSO
.Xr em 4 ,
.Xr intro 4 ,
.Xr netintro 4 ,
.Xr pci 4
.Pp
Intel's EP80579 Datasheet:
.Lk http://download.intel.com/design/intarch/ep80579/320066.pdf
.Sh HISTORY
The
.Nm
driver first appeared in
.Ox 4.7 .
.Sh AUTHORS
The
.Nm
driver was written by
.An Dariusz Swiderski Aq Mt dms@openbsd.org ,
partially based on the
.Fx
driver released by Intel under the ISC license.
